Mechanics

OBD PINOUT PROBLEM

1995 Buick Park Avenue

Computer problem
1995 Buick Park Avenue 6 cyl Two Wheel Drive Automatic

Apparently I have an OBD1 computer with an OBD2 connector. The pinout will not work with an OBD2 scanner.

The check engine light came on after the car suddenly started backfiring and idleing erratically. I know there is a code in the computer but I don't know how to retrieve it. With OBD1 you can jump pins A& B and get the code from the check engine light. But in this configuration, I don't know where A& B are.

The pinout is as follows
(it's a 16 pin connnector. * = No pin and x=pin:

* * x x x * * x
x * x * * x * x

Can you help me?

Thanks
Steve
Avatar
Steviek
August 23, 2009.




Try this: Don't work you need a scantool that can read OBD2 code/s or take it to Autozone its a free sercvice


http://www.2carpros.com/forum/automotive_pictures/12900_GM_ALCL_41.jpg


Rasmataz
Aug 23, 2009.
Sorry need Tech 1 scanner on 16 pin


http://www.2carpros.com/forum/automotive_pictures/198357_Graphic_97.jpg


Docfixit
Aug 23, 2009.
Raz and Doc,

Gentlemen, Thank you for answering my question so quickly. I'm still in a quandry though.

The problem is I have an OBD1 computer, but I don't have the OBD 1 connector shown in Raz's illustration. I have an OBD 2 style connector If you look at the pin out I diagrammed you'll see that it doesn't match the pinout of the OBD1, or the typical OBD 2. Since the computer is an OBD1, I think it still has the A& B pins, just in a different location.

Doc, I'm not familiar with a Tech 1. I've seen other OBD 2 scanners, but I get linking errors because the pins in the scanners don't match the pins in the 16 pin connector on my Buick, since the computer is an OBD 1.

Some of the more expensive OBD2 scanners have cables for OBD1, but they're for the typical connectors shown in Raz's illustration. Which I don't have on my car.

Most auto part stores will not let you return a scanner, and I'm concerned that if I buy one that doesn't work, I'm stuck with it and will be out of a lot of money.

Wow, sound's like I'm rambling. Sorry. It's just a bizzare problem.

Any further input guys?

Thanks again for your help
Steve

Tiny
Steviek
Aug 23, 2009.
Sir, I viewed your DLC it has the 16 pin IAW Mit1 ondemand.com and also it requires the use of the Tech1 to pull the OBD1 codes.

Conversion trouble codes from the OBD1 codes to OBD2


http://www.2carpros.com/forum/automotive_pictures/12900_dtc1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/12900_dtc2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/12900_dtc3_1.jpg


http://www.2carpros.com/forum/automotive_pictures/12900_dtc4_1.jpg


Rasmataz
Aug 24, 2009.
Rasmataz,

Thanks again for your efforts! Is a tech 1 commercially available or is something that only a dealer or shop would have?

Steve
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Tiny
Steviek
Aug 24, 2009.
Dunno if its commercially available but the dealership should have it, maybe some reputable shops.

Rasmataz
Aug 24, 2009.

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